Hydration (Bread)

Hydration in bread baking is the ratio of water to flour expressed as a percentage. A dough made with 1,000g of flour and 700g of water sits at 70% hydration. This single number tells you more about how your bread will look, feel, and taste than almost any other variable in the recipe.

Hydration is part of the baker's percentage system, where every ingredient is expressed as a percentage of total flour weight. Flour is always 100%, and everything else is relative to it. Understanding hydration is the key to reading bread formulas, adapting recipes, and troubleshooting dough behavior.

How to calculate dough hydration

The formula is straightforward:

Hydration % = (total water weight ÷ total flour weight) × 100

For a recipe with 500g flour and 350g water: 350 ÷ 500 × 100 = 70% hydration.

When calculating, include all sources of water and flour:

• Water in a poolish or biga counts toward total water
• Flour in the pre-ferment counts toward total flour
• Eggs are roughly 75% water and 13% protein, so include their water contribution in enriched doughs
• Milk is roughly 87% water. Factor it in when substituting for water

I kept a spreadsheet for my first few months of baking where I logged actual hydration vs how the dough felt. That habit taught me more about flour absorption than any guide ever could.

The dough hydration chart

Most beginner-friendly bread recipes sit at 60-68% hydration. Once you're comfortable with dough handling, working your way up to 72-75% unlocks the open, airy crumb structure that many bakers aspire to.

How hydration affects your bread

Crumb structure

Higher hydration produces larger, more irregular holes in the crumb. Water creates steam during baking, which inflates the bubbles created during fermentation. More water means more steam, bigger bubbles, and a more open crumb. The gluten network stretches thinner around these larger bubbles, creating the translucent, slightly glossy cell walls you see in well-made ciabatta.

Crust

Wetter doughs produce crispier, more blistered crusts. The extra water at the surface creates more steam in the oven, which promotes the gelatinization of starches on the crust. That's the same process that makes a baguette crust shatter when you bite into it.

Flavor

Higher hydration doughs ferment slightly differently. The extra water makes sugars more accessible to yeast and bacteria, which can produce more organic acids during long fermentation. This is one reason why high-hydration sourdoughs often have more complex, tangy flavor.

Shelf life

More water in the dough means more moisture retained in the baked bread. High-hydration breads stay fresh longer than low-hydration ones, which dry out faster. I've noticed my 75% hydration country loaves still have a soft crumb on day three, while my 62% sandwich loaves start to firm up by day two.

Handling difficulty

Higher hydration dough is stickier and harder to shape. This is the tradeoff: the bread you want (open crumb, crispy crust) requires dough that doesn't cooperate during handling. Technique, particularly stretch and folds during bulk fermentation, compensates for this.

Is high-hydration bread better?

Not necessarily. Higher hydration isn't a universal upgrade. A 65% sandwich loaf needs a tight, even crumb so it holds fillings without falling apart. A bagel at 80% hydration would be a shapeless puddle. The "best" hydration depends on the bread you're making.

That said, if you want open crumb and crispy crust, you do need to push hydration higher. The trick is finding the highest hydration you can handle reliably with your flour and technique. For most home bakers, that sweet spot lands between 70-76%.

Factors that change effective hydration

The same 70% hydration feels different depending on several variables:

Flour type. Whole wheat and rye absorb significantly more water than white flour. A 70% whole wheat dough feels drier than a 70% white flour dough. When using whole grains, increase hydration by 5-10% to compensate. An autolyse gives whole grain flours time to absorb water fully before mixing.

Protein content. Higher-protein bread flour (12-14% protein) absorbs more water and produces stronger gluten than lower-protein all-purpose flour (10-12%). If your dough feels wetter than expected, your flour may have less protein than the recipe assumes.

Humidity. On humid days, flour has already absorbed moisture from the air. Your dough may feel wetter at the same hydration percentage. Some bakers hold back 2-3% of the water and add it only if the dough seems dry after mixing.

Inclusions. Seeds, nuts, dried fruit, and olives absorb water from the dough. If adding inclusions, either soak them first or increase hydration slightly to compensate.

Temperature. Warmer water makes dough feel stickier. This doesn't change the actual hydration but affects how the dough handles.

Bassinage: adding water in phases

Bassinage is the technique of holding back 5-10% of the water during initial mixing and adding it later, after the gluten network has started to develop. It's a game-changer for high-hydration doughs.

Here's why it works: flour absorbs water more efficiently when the gluten network isn't fully loaded. Mix your dough at a lower hydration first (say, 68%), develop the gluten with a few minutes of mixing, then slowly incorporate the remaining water. The dough accepts it more readily, and you end up with a stronger, more extensible dough than if you'd dumped all the water in at once.

I started using bassinage after struggling with an 80% ciabatta that kept tearing during folds. Holding back 50g of water and adding it after 5 minutes of mixing made the dough manageable without sacrificing the open crumb.

Tips for working with high-hydration dough

Common hydration problems

Hydration for pizza dough

Pizza dough hydration varies by style:

For detailed pizza dough hydration guides, see our pizza dough hydration guide. Use our pizza dough calculator to see exact water amounts for any hydration level and style.

Hydration in Fond

Fond's Bread Studio and Pizza Workshop calculate hydration automatically as you adjust your recipe. Add more water or change flour amounts and the hydration percentage updates in real-time. The app also suggests target hydration ranges based on the bread style you've selected, so you know whether your formula is in the right ballpark before you mix.

Frequently asked questions

What does 70% hydration mean?

It means the water weighs 70% of the flour weight. For 1,000g of flour, you'd use 700g of water. It's a baker's percentage measurement, not a fraction of the total dough weight. A 70% hydration dough feels moderately sticky and produces bread with an open, airy crumb.

What hydration should I start with as a beginner?

Start at 65% hydration with bread flour. This produces a manageable dough that still makes good bread. As you get comfortable with shaping and handling, increase by 2-3% at a time. Most bakers find their sweet spot between 70-75%.

Is high-hydration bread better than low hydration?

Neither is inherently better. High hydration gives you open crumb, crispy crust, and longer shelf life, but it's harder to handle. Low hydration gives you tight, even crumb that's perfect for sandwiches and toast. Match the hydration to the bread style you're making.

Can I just add more water to any recipe?

You can increase hydration, but the dough will behave differently and may need technique adjustments. Higher hydration requires stronger gluten (more mixing or folds), longer bulk fermentation, and often cold fermentation for easier shaping. Try bassinage if you want to push past 75%.

Why is my high-hydration dough flat?

Two common causes: weak gluten development (not enough folds or mixing) or over-fermentation (the gluten structure broke down). Build more structure through folds during bulk fermentation, and watch for signs of over-proofing.

Does hydration include oil, butter, or eggs?

Traditionally, hydration refers only to water. However, eggs and milk contain water that contributes to the dough's effective hydration. Oil and butter don't contribute to hydration in the baker's percentage system, but they do affect dough texture and feel.